Ceramics fired with Raku technique.
Raku firing results are unpredictable and the intense color attract many modern potters. These patterns and color result from the harsh cooling process and the amount of oxygen that is allowed to reach the pottery
If you want to read more about Raku or Raku-yaki 楽焼 (it originated in Japan)
here is a wikipedia link:
Above and below “Sea Wall”, front and back